java jlabel点击,我想通过单击添加按钮动态添加JLabel和文本框

雨点打透心脏的1/2处 2023-01-24 04:21 11阅读 0赞

![Image 1][]

When i create the text and label box dynamically it should sit in the format of "Textbox: Labelbox" then when i click on add button again the same pattern should repeat on next line and so on... Which layout should i use and how ?

This is the code i used

if(field\_name.getText().equals(""))\{

error.setForeground(Color.red);

error.setText("Enter the Field name first");

\} else \{

JLabel l = new JLabel(field\_name.getText(), JLabel.RIGHT);

JTextField textField = new JTextField();

Dimension dim = new Dimension(20,30);

textField.setPreferredSize(dim);

field\_layer.add(l);

field\_layer.add(textField);

SpringUtilities.makeCompactGrid(field\_layer,

numPairs, 2, //rows, cols

6, 6, //initX, initY

6, 6); //xPad, yPad

numPairs++;

field\_layer.invalidate();

this.pack();

解决方案

One option is GridBagLayout. In order to use this layout properly, you'll need to understand GridBagConstraints. Here's a tutorial to help you get started.

Here's a quick example:

import java.awt.Dimension;

import java.awt.GridBagConstraints;

import java.awt.GridBagLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.ArrayList;

import java.util.List;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JTextField;

import javax.swing.border.LineBorder;

public class MyExample

// Field members

static JPanel panel = new JPanel();

static Integer indexer = 1;

static List listOfLabels = new ArrayList();

static List listOfTextFields = new ArrayList();

public static void main(String\[\] args)

// Construct frame

JFrame frame = new JFrame();

frame.setLayout(new GridBagLayout());

frame.setPreferredSize(new Dimension(300, 300));

frame.setTitle("My Example");

frame.setDefaultCloseOperation(JFrame.EXIT\_ON\_CLOSE);

// Frame constraints

GridBagConstraints frameConstraints = new GridBagConstraints();

// Construct button

JButton addButton = new JButton("Add");

addButton.addActionListener(new ButtonListener());

// Add button to frame

frameConstraints.gridx = 0;

frameConstraints.gridy = 0;

frame.add(addButton, frameConstraints);

// Construct panel

panel.setPreferredSize(new Dimension(200, 200));

panel.setLayout(new GridBagLayout());

panel.setBorder(LineBorder.createBlackLineBorder());

// Add panel to frame

frameConstraints.gridx = 0;

frameConstraints.gridy = 1;

frameConstraints.weighty = 1;

frame.add(panel, frameConstraints);

// Pack frame

frame.pack();

// Make frame visible

frame.setVisible(true);

static class ButtonListener implements ActionListener

@Override

public void actionPerformed(ActionEvent arg0)

// Clear panel

panel.removeAll();

// Create label and text field

listOfTextFields.add(new JTextField());

listOfLabels.add(new JLabel("Label " + indexer));

// Create constraints

GridBagConstraints textFieldConstraints = new GridBagConstraints();

GridBagConstraints labelConstraints = new GridBagConstraints();

// Add labels and text fields

for(int i = 0; i < indexer; i++)

// Text field constraints

textFieldConstraints.gridx = 0;

textFieldConstraints.gridy = i;

// Label constraints

labelConstraints.gridx = 1;

labelConstraints.gridy = i;

// Add them to panel

panel.add(listOfTextFields.get(i), textFieldConstraints);

panel.add(listOfLabels.get(i), labelConstraints);

// Align components top-to-bottom

GridBagConstraints c = new GridBagConstraints();

c.gridx = 0;

c.gridy = indexer;

c.weighty = 1;

panel.add(new JLabel(), c);

// Increment indexer

indexer++;

Note: don't limit yourself to this particular layout manager. That is, you should explore other Layout Managers too.

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java jlabel点击,我想通过单击添加按钮动态添加JLabel和文本框

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